:root {
    /* Linear-inspired Light Mode Variables (fallback/toggle) */
    --bg-color: #ffffff;
    --bg-alt: #fafafa;
    --text-color: #111827;
    --text-muted: #6b7280;
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --border-color: rgba(0,0,0,0.08);
    --card-bg: #ffffff;
    --card-hover-bg: #f9fafb;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.08);
    --nav-bg: rgba(255, 255, 255, 0.85);
    --accent-glow: rgba(37, 99, 235, 0.15);
}

[data-theme="dark"] {
    /* Linear-inspired Dark UI (Obsidian & Cobalt) */
    --bg-color: #08090C;
    --bg-alt: #0C0E12;
    --text-color: #EDEDED;
    --text-muted: #8A8F98;
    --primary-color: #3B82F6;
    --primary-hover: #60A5FA;
    --border-color: rgba(255, 255, 255, 0.08);
    --card-bg: #111216;
    --card-hover-bg: #15171C;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    --shadow-hover: 0 16px 40px rgba(0, 0, 0, 0.7);
    --nav-bg: rgba(8, 9, 12, 0.85);
    --accent-glow: rgba(59, 130, 246, 0.15);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
}

.font-mono {
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: -0.02em;
}

a { color: var(--text-color); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-hover); }
ul { list-style: none; }

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4 { color: var(--text-color); font-weight: 600; letter-spacing: -0.02em; }
.headline { font-size: 3.5rem; font-weight: 700; line-height: 1.1; margin-bottom: 1.5rem; letter-spacing: -0.04em; }
.subheadline { font-size: 1.15rem; color: var(--text-muted); margin-bottom: 2.5rem; max-width: 600px; }
.section-title { font-size: 2rem; margin-bottom: 2.5rem; border-bottom: 1px solid var(--border-color); padding-bottom: 1rem; display: inline-block; }
.text-gradient {
    background: linear-gradient(90deg, #FFFFFF 0%, #8A8F98 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
[data-theme="light"] .text-gradient {
    background: linear-gradient(90deg, #111827 0%, #6b7280 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    border: 1px solid transparent;
}
.btn-primary {
    background-color: var(--primary-color);
    color: #fff !important;
    box-shadow: 0 0 0 1px rgba(0,0,0,0.1), inset 0 1px 0 rgba(255,255,255,0.2);
}
.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 0 0 1px rgba(0,0,0,0.1), inset 0 1px 0 rgba(255,255,255,0.2), 0 4px 12px var(--accent-glow);
}
.btn-outline {
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--border-color);
    color: var(--text-color);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.08);
    border-color: rgba(255,255,255,0.2);
}
[data-theme="light"] .btn-outline { background: rgba(0,0,0,0.02); }
[data-theme="light"] .btn-outline:hover { background: rgba(0,0,0,0.05); border-color: rgba(0,0,0,0.2); }

.btn-large { padding: 12px 24px; font-size: 1rem; }
.btn-small { padding: 4px 12px; font-size: 0.8rem; border-radius: 4px; }
.full-width { width: 100%; }

/* Navbar */
.navbar {
    position: fixed;
    top: 0; width: 100%;
    background-color: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    height: 64px;
    display: flex; align-items: center;
}
.nav-container { display: flex; justify-content: space-between; align-items: center; width: 100%; }
.nav-left { display: flex; align-items: center; gap: 16px; }
.logo { font-size: 1.1rem; font-weight: 600; color: var(--text-color); letter-spacing: -0.02em; }

/* Status Pill */
.status-pill {
    display: flex; align-items: center; gap: 6px;
    padding: 4px 10px;
    border-radius: 20px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border-color);
    font-size: 0.75rem; font-weight: 500;
    color: var(--text-muted);
}
.status-pill .dot {
    width: 6px; height: 6px; border-radius: 50%;
    background-color: #10B981; /* Green */
    box-shadow: 0 0 8px #10B981;
}

.nav-links { display: flex; gap: 24px; }
.nav-links a { font-size: 0.9rem; font-weight: 500; color: var(--text-muted); }
.nav-links a:hover { color: var(--text-color); }

.nav-actions { display: flex; align-items: center; gap: 16px; }
.protocol-tags { display: flex; gap: 8px; }
.protocol-tags span {
    font-size: 0.7rem; font-weight: 600; text-transform: uppercase;
    padding: 2px 6px; border-radius: 4px;
    background: var(--card-bg); border: 1px solid var(--border-color);
    color: var(--text-muted);
}

.theme-toggle {
    background: transparent; border: none; color: var(--text-muted);
    cursor: pointer; display: flex; align-items: center; padding: 4px;
    transition: color 0.2s;
}
.theme-toggle:hover { color: var(--text-color); }
.theme-toggle svg { width: 18px; height: 18px; }
.sun-icon { display: none; }
[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }

/* Sections */
.section { padding: 100px 0; }
.section-spacing { padding: 140px 0 100px; }
.bg-alt { background-color: var(--bg-alt); border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); }

/* Hero */
.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}
.hero-actions { display: flex; gap: 16px; margin-top: 24px; }

/* Bento Cards (Spring Physics) */
.bento-card {
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.4s ease, border-color 0.4s ease, background-color 0.4s ease;
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    border-radius: 12px;
    padding: 32px;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow);
}
.bento-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(255, 255, 255, 0.15);
    background: var(--card-hover-bg);
}
[data-theme="light"] .bento-card:hover { border-color: rgba(0,0,0,0.15); }

.bento-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.bento-desc { color: var(--text-muted); font-size: 0.95rem; margin-top: 12px; transition: opacity 0.3s; }
.bento-card h3 { font-size: 1.2rem; }

.secondary-metrics {
    position: absolute;
    bottom: 24px; left: 32px; right: 32px;
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--primary-color);
    display: flex; justify-content: space-between;
    border-top: 1px solid var(--border-color);
    padding-top: 12px;
}
.bento-card:hover .secondary-metrics { opacity: 1; transform: translateY(0); }
.bento-card:hover .bento-desc { opacity: 0.2; }

/* Interactive Widgets */
.ping-sandbox { padding: 24px; }
.sandbox-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; border-bottom: 1px solid var(--border-color); padding-bottom: 12px; }
.sandbox-title { font-size: 0.85rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-muted); }
.ping-bars { display: flex; flex-direction: column; gap: 12px; }
.ping-row { display: grid; grid-template-columns: 80px 1fr 60px; align-items: center; gap: 12px; font-size: 0.85rem; }
.node { color: var(--text-muted); font-weight: 500; }
.bar-track { height: 4px; background: rgba(255,255,255,0.05); border-radius: 2px; overflow: hidden; width: 100%; }
[data-theme="light"] .bar-track { background: rgba(0,0,0,0.05); }
.bar { height: 100%; background: var(--primary-color); width: 0%; transition: width 0.4s cubic-bezier(0.16, 1, 0.3, 1); }
.ms { text-align: right; color: var(--text-color); }

.calculator { padding: 24px; }
.mt-4 { margin-top: 24px; }
.slider {
    -webkit-appearance: none; width: 100%; height: 4px; border-radius: 2px;
    background: rgba(255,255,255,0.1); outline: none; margin: 20px 0;
}
[data-theme="light"] .slider { background: rgba(0,0,0,0.1); }
.slider::-webkit-slider-thumb {
    -webkit-appearance: none; appearance: none;
    width: 16px; height: 16px; border-radius: 50%;
    background: var(--primary-color); cursor: pointer;
    box-shadow: 0 0 10px var(--accent-glow);
}
.calc-results { display: flex; justify-content: space-between; border-top: 1px solid var(--border-color); padding-top: 16px; }
.calc-item { display: flex; flex-direction: column; gap: 4px; }
.calc-item .label { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; }
.calc-item .value { font-size: 1.1rem; font-weight: 600; color: var(--text-color); }
.calc-item .accent { color: var(--primary-color); }

/* Unlock Grid */
.unlock-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.unlock-card { padding: 32px; }
.unlock-header { font-size: 1.2rem; font-weight: 600; margin-bottom: 20px; color: var(--primary-color); }
.unlock-list li { padding: 8px 0; border-bottom: 1px solid var(--border-color); color: var(--text-color); font-size: 0.95rem; }
.unlock-list li:last-child { border-bottom: none; }

/* Pricing Grid */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pricing-card { display: flex; flex-direction: column; }
.pricing-card.featured { border-color: var(--primary-color); box-shadow: 0 0 24px var(--accent-glow); }
.pricing-badge {
    position: absolute; top: 0; right: 24px;
    background: var(--primary-color); color: #fff;
    padding: 4px 12px; border-bottom-left-radius: 6px; border-bottom-right-radius: 6px;
    font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em;
}
.pricing-header { margin-bottom: 24px; }
.pricing-header h3 { font-size: 1.1rem; color: var(--text-muted); margin-bottom: 8px; }
.price { font-size: 3rem; font-weight: 700; color: var(--text-color); line-height: 1; }
.price span { font-size: 1rem; color: var(--text-muted); font-weight: 500; font-family: 'Inter', sans-serif; }
.pricing-features { flex-grow: 1; margin-bottom: 32px; }
.pricing-features li { padding: 12px 0; border-bottom: 1px solid var(--border-color); font-size: 0.9rem; color: var(--text-muted); }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 16px; max-width: 800px; margin: 0 auto; }
.faq-item { padding: 24px 32px; }
.faq-item h4 { font-size: 1.05rem; margin-bottom: 12px; }
.faq-item p { color: var(--text-muted); font-size: 0.95rem; }

/* Footer */
.footer { padding: 60px 0 40px; border-top: 1px solid var(--border-color); font-size: 0.9rem; }
.footer-content { display: flex; justify-content: space-between; margin-bottom: 40px; }
.footer-brand h3 { font-size: 1.1rem; margin-bottom: 8px; }
.footer-brand p { color: var(--text-muted); font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; }
.footer-links { display: flex; gap: 24px; }
.footer-links a { color: var(--text-muted); }
.footer-links a:hover { color: var(--text-color); }
.footer-bottom { border-top: 1px solid var(--border-color); padding-top: 24px; color: var(--text-muted); font-size: 0.8rem; text-align: center; }

/* Subpages */
.page-container { padding: 120px 24px 80px; max-width: 760px; min-height: 80vh; margin: 0 auto; }
.page-container h1 { font-size: 2.5rem; margin-bottom: 40px; }
.page-content h2 { margin-top: 40px; margin-bottom: 16px; font-size: 1.5rem; }
.page-content p { color: var(--text-muted); margin-bottom: 16px; font-size: 1rem; }
.page-content ul { list-style-type: disc; padding-left: 20px; color: var(--text-muted); margin-bottom: 16px; }
.page-content li { margin-bottom: 8px; }
.page-content a { color: var(--primary-color); text-decoration: underline; }

/* Mobile */
@media (max-width: 900px) {
    .nav-links, .protocol-tags, .status-pill { display: none; }
    .hero-grid, .bento-grid, .pricing-grid, .unlock-grid { grid-template-columns: 1fr; }
    .hero-text { text-align: center; }
    .hero-actions { justify-content: center; flex-direction: column; }
    .headline { font-size: 2.5rem; }
    .footer-content { flex-direction: column; gap: 32px; }
    .footer-links { flex-direction: column; gap: 12px; }
}